NCP1252APG Datasheet PDF - ON Semiconductor

The NCP1252 controller offers everything needed to build cost−effective and reliable ac−dc switching supplies dedicated to ATX power supplies. Thanks to the use of an internally fixed timer, NCP1252 detects an output overload without relying on the auxiliary Vcc. A Brown−Out input offers protection against low input voltages and improves the converter safety. Finally a SOIC8 package saves PCB space and represents a solution of choice in cost sensitive project.

●Features

●• Peak Current Mode Control

●• Adjustable Switching Frequency up to 500 kHz

●• Jittering Frequency ±5% of the Switching Frequency

●• Latched Primary Over Current Protection with 10 ms Fixed Delay

●• Delayed Operation Upon Start−up via an Internal Fixed Timer

●• Adjustable Soft−start Timer

●• Auto−recovery Brown−Out Detection

●• UC384X−like UVLO Thresholds

●• Vcc Range from 9 V to 28 V with Auto−recovery UVLO

●• Internal 160 ns Leading Edge Blanking

●• Adjustable Internal Ramp Compensation

●• +500 mA / –800 mA Source / Sink Capability

●• Maximum 50% Duty Cycle: A Version

●• Maximum 80% Duty Cycle: B Version

●• Maximum 65% Duty Cycle: C Version

●• Ready for Updated No Load Regulation Specifications

●• SOIC−8 and PDIP−8 Packages

●• These are Pb−Free Devices

●Typical Applications

●• Power Supplies for PC Silver Boxes, Games Adapter...

●• Flyback and Forward Converter